摘要
将可溶性钴盐溶解在氨水溶液中生成六氨合钴离子 ([Co(NH3 ) 6]2 + ) ,利用 [Co(NH3 ) 6]2 + 能络合NO和活化氧分子的特性 ,实现NO的吸收和氧化同时进行 ,从而将NO从废气中脱除掉并转化为硝酸根和亚硝酸根 .用活性炭作催化剂实现[Co(NH3 ) 6]2 + 离子的再生 ,保持 [Co(NH3 ) 6]2 + 溶液能长时间高效率地脱除废气中的NO .研究结果表明 :用活性炭催化还原[Co(NH3 ) 6]3 + 的转化率随着温度的升高而增大 ;在固定床催化反应器中 ,活性炭颗粒的大小对催化效果的影响不大 ;[Co(NH3 ) 6]2 + 溶液能有效地脱除废气中的NO ,废气中的氧有利于NO的脱除 ,采用活性炭催化再生 [Co(NH3 ) 6]2 + 后 ,0 0 2mol/L [Co(NH3 ) 6]2 + 溶液脱除NO的效率能长期保持在 80 %以上 .该法是一种经济、高效、简便的NO污染治理方法 .
Aqueous ammonia solution can be used to remove NO from waste gas streams by adding soluble cobalt(Ⅱ) salt into aqueous ammonia solution. The hexamminecobalt(II) cations can not only bind nitric oxide but also activate oxygen molecules in aqueous solutions. Nitric oxide is absorbed and oxidized simultaneously in the same reactor. Nitric oxide can be turned into nitrite and nitrate. Activated carbon is used to catalyze the reduction of hexamminecobalt (Ⅲ) to hexamminecobalt (Ⅱ) to maintain the capability of removing NO with the hexamminecobalt solution. The influences of temperature and activated carbon particle size on the conversion of hexamminecobalt (Ⅲ) are investigated. According to the experimental results, the catalytic reduction reaction rate increased with temperature. The influence of particle size of AC on the reduction of hexamminecobalt (Ⅲ) in fixed bed reactor was very little. Oxygen in the gas phase was beneficial to the absorption of NO into the hexamminecobalt solution. The experiments performe manifestly that the hexamminecobalt solution coupled with catalytic regeneration of hexamminecobalt (Ⅱ) was able to maintain a high nitric oxide removal efficiency for a long time. This method may have a bright promise in application.
出处
《环境科学》
EI
CAS
CSCD
北大核心
2005年第1期20-23,共4页
Environmental Science
基金
国家自然科学基金资助项目 (2 963 3 0 3 0 )
关键词
一氧化氮
催化还原
活性炭
钴氨络离子
液固反应
气液反应
nitric oxide
catalytic reduction
activated carbon
hexamminecobalt
liquid-solid reaction
gas-liquid reaction
